DE29511295U1 - Dishwasher with improved damping devices - Google Patents

Description

HERRMANN - TRENTE*P<Ü>HL\.· I BJ[?£>PEAN PATENT ATTORNEYS

KIRSOHNER - LARGE PATENT & LAWYERS

BOOKHORNI 8t PARTNER MUNICH ■ HERNE ■ LEIPZIG

W. Herrmann-Trentepohl, Dipl.-Ing., Herne Klaus D. Kirschner, Dipl.-Phys., Munich Wolfgang Grosse, Dipl.-Ing., Munich Josef Bockhorni, Dipl.-!ng., Munich Dr. Christian Thiel, Dip!.-Chem., Herne Markus Strasse, Attorney, Munich ZanUSSi Elettrodomestici SpA Johannes Dieterle, DIpL-In ₀ .. Leipzig

Via Giardini CattaneO 3 Forstenrieder Allee 59 ■ 81470 Munich

&ldquor;. __&ldquor;&rdquor;-. &ldquor; . ta 089-745541-0 · Telex 8-229853 pakid

1-33170 Pordenone Fax 0 89-7 59 38 69 group &Pgr; & III

Italy Schaeferstraße 18 · 44623 Herne

es 0 23 23-9 5440 · Telex 8-229 853 Fax O 23 23 -1 22 32 group Il &. 111

Hainstrasse© 20/24 · 04109 Leipzig

ep 0341-2 11 38 18

Fax 03 41-2 11 38 18 group II & IH

Munich

July 10, 1995

B 69168 DE (GS/LE)

Dishwashers with improved dampening devices

The innovation concerns a dishwasher, in particular a domestic dishwasher, equipped with special devices for dampening the vibrations generated and transmitted by the motor of the circulation pump.

There are known household dishwashers with a washing container, the lower part of which is closed by a separate component, which is generally known as a "dirty water chute".

This shaft mainly has the functions of accommodating the filters for the rinsing liquid, the impellers of the pumps for circulation and pumping out, as well as the part of the circulation line that supports the lower spray arm and supplies it with liquid pumped by the circulation pump.

Recent technical developments have led to the result that the pumps mentioned for circulation and pumping out have been combined into a single pump, and for the sake of simplicity, reference is made here to this one pump.

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Deutsche Bank, Herne (BlZ 430 700 61) Account number 6*145510 ■ Bank of Moenokien (Bl2 700 202 70) Account number-, 46 505

Postal check Munich (bank code 700 100 80) Account number: 227 082 - 805

However, it is understood that the innovation applies, regardless of this, to both pumps and the corresponding impellers in dishwashers equipped with the two pumps mentioned.

In view of the complex construction of this shaft, it is therefore expediently manufactured as a separate component, generally made of plastic, and only then firmly and tightly connected to the base part of the washing tank so that it forms a single, sealed unit with it.

This type of construction can be implemented in many different ways depending on the functional and construction requirements and is generally satisfactory.

However, it has a disadvantage that has not yet been effectively eliminated, namely that the impeller of the pump in the shaft causes a disturbing noise, which has two reasons: The first reason is that the shaft for transmitting the movement of the pump motor located outside the shaft to the impeller of the pump located inside it must pass through a suitable, naturally sealed hole provided in the wall of the shaft.

This fact means that the vibrations and noise caused by the motor in the shaft are transmitted to the shaft which, being made of a rigid material and hollow, acts as a soundboard and transmits the noise to the washing tank and from there to the entire machine in general.

The second reason is that this motor is normally attached directly or indirectly to the base of the machine, and this results in the analogous phenomenon that the vibrations and noise generated by the motor are transmitted via this base to the entire machine.

It would therefore be desirable, and is the purpose of this innovation, to design a dishwasher with a pump and the relevant built-in accessories suitable for preventing all the above-mentioned disadvantages and for such a design to be producible in a simple, reliable and economical manner and using present-day technologies.

Such a solution is achieved as described in the appended claims of the innovation. The innovation will be more clearly understood from the following description, which is given purely as a non-limiting example and with reference to the appended drawings, in which

Figures 1 and 2 show in cross-section from the front the washing container and the base part of a household dishwasher according to the innovation,

Fig. 3 is an enlargement of a detail of Fig. 2,

- Fig. 4 shows a cross-section of a detail of Fig. 2,

Fig. 5 shows a variant of the detail of Fig. 3.

Referring to Figures 1 and 2, a domestic dishwasher is shown comprising a washing tank 1, a lower chute 2 tightly fitted to the lower part of said washing tank, and a pump for circulating or pumping out water consisting of an impeller 4 located in said chute and a motor 5 located outside it.

Said motor is stably mounted on a base part of the dishwasher and in any case on a suitable support means 3. According to the state of the art, the transmission shaft connecting the motor to the impeller is

a continuous element and rotates in suitable rotary sliding elements, which are tightly fitted in a hole in the wall of the shaft.

The innovation essentially consists in providing the motor with complete insulation between its parts in contact with the elements of the external structure and said elements, so that the noise and vibrations transmitted by said parts of the motor are effectively and practically completely blocked. For this purpose, the motor shaft is divided into two coaxial and separate sections, the first section 6 of which is connected to the impeller by extending through a hole in the wall of the shaft, and the second section 7 of which is connected to the motor rotor.

The said sections are then connected to one another by an elastic connection and in particular - with reference to the figures - this connection consists of an internally hollow sleeve 8, into the hollow end sections of which the opposite ends 9, 10 of the said first section 6 and second section 7 are introduced and locked.

As regards the insulation between the motor and its support structure or means 3, this is carried out by interposing suitable elastic elements therebetween; it has been found that a particularly effective and easy-to-install elastic element consists of at least one elastic band 11 made of an elastic material, preferably an elastomer, which surrounds the motor and is fixed to said support means 3 by means known per se; advantageously, said at least one band 11 is provided in its contact area with the support means 3 with a projection 12 suitable for snapping into a suitable through hole 13,

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which is provided in said support means in the contact area with said band element.

It has also been found that the damping effect is further enhanced if the section 14 of said band located between the motor and the support means has several recesses or through holes 15.

A practical and economical variant of this belt is carried out by arranging several elastic elements 17 between the said support means 3 and several respective feet 16 which support the said motor.

Claims (1)

Expectations 1. Dishwasher, preferably a domestic dishwasher, provided with a washing tank (1), with a pump for circulating or pumping out or both, with a structure consisting of a shaft (2) attached to the bottom of said washing tank and with at least one base part or support means for said pump, the latter consisting of an impeller (4) located in said shaft, a motor (5) located outside the shaft and connected to said base part or support means (3) and a shaft for transmitting the movement from said motor to said impeller, characterized in that said motor is at least partially elastically insulated from said structure. 2. Dishwasher according to claim 1, characterized in that said motion transmission shaft consists of two individual and coaxial sections, that a first section (6) is connected to the impeller (4), and the second section (7) is connected to the rotor of the motor, that the boundary region between said first and second sections (6, 7) is located outside the shaft, and that an elastic connection (8) connects said sections (6, 7). 3. Dishwasher according to claim 2, characterized in that said elastic connection consists of an internally hollow sleeve and that in the hollow end sections of which the opposite ends (9, 10) of said first and second sections are supported and locked. -&Iacgr;&Agr;. Dishwasher according to claim 1, characterized in that said motor (5) is connected to said support means (3) by at least one band element (11) surrounding said motor and fixed to said support means, and in that said band element is elastic. 5. Dishwasher according to claim 4, characterized in that said band element is provided with a projection (12) arranged externally thereon and suitable for being introduced into and locking by snapping into a suitable through hole (13) provided in said support means (3) in the contact area between said band element and said support means. 6. Dishwasher according to claim 4 or 5, characterized in that the portion of said band (14) arranged between the motor and said support means has a plurality of recesses or through holes (15) which are suitable for improving the elastic insulation of said motor with respect to said support means (3). 7. Dishwasher according to claim 1, characterized in that a plurality of support feet (16) are connected to said motor and that a plurality of elastic elements (17) are each arranged between said support means (3) and said feet (16).